
Configuring IP Services
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Specifying the Network Type
OSPF interfaces support communications over four network types:
• Broadcast. A broadcast interface supports multiple routers. OSPF can address
a single physical message to all attached routers. Examples of such a network
are Ethernet, FDDI, and token ring.
• Nonbroadcast multiaccess (NBMA). An NBMA interface supports multiple
routers. However, OSPF cannot address a single physical message to all
routers. Examples of such a network are frame relay and X.25.
• Point-to-point. A point-to-point interface joins a single pair of OSPF routers.
An example of such a network is a network of synchronous lines.
• Point-to-multipoint. A point-to-multipoint interface supports multiple routers
in a partial mesh configuration. Bay Networks supports the standard OSPF
point-to-multipoint interface and also provides a proprietary
point-to-multipoint solution for routers running OSPF in star frame relay
topologies.
• Passive. A passive interface only receives advertisements. OSPF cannot use it
to form neighbor relationships, accept hello messages, or send
advertisements. On other interfaces, OSPF advertise the network attached to a
passive interface as a stub network.
By default, OSPF assumes that the interface is attached to a broadcast
network.You can use the BCC or Site Manager to specify another network type.
Note:
If the interface is connected to an NBMA network, you need to
configure neighbors manually.
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